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用UDP实现聊天功能

2024-11-14 04:19:01   202人阅读

// SK003Dlg.cpp : implementation file
//
 
#include "stdafx.h"
#include "SK003.h"
#include "SK003Dlg.h"
 
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
 
#define WM_RECVTEXT (WM_USER + 100)
/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About
 
class CAboutDlg : public CDialog
{
public:
 CAboutDlg();
 
// Dialog Data
 //{{AFX_DATA(CAboutDlg)
 enum { IDD = IDD_ABOUTBOX };
 //}}AFX_DATA
 
 // ClassWizard generated virtual function overrides
 //{{AFX_VIRTUAL(CAboutDlg)
 protected:
 virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
 //}}AFX_VIRTUAL
 
// Implementation
protected:
 //{{AFX_MSG(CAboutDlg)
 //}}AFX_MSG
 DECLARE_MESSAGE_MAP()
};
 
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
 //{{AFX_DATA_INIT(CAboutDlg)
 //}}AFX_DATA_INIT
}
 
void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
 CDialog::DoDataExchange(pDX);
 //{{AFX_DATA_MAP(CAboutDlg)
 //}}AFX_DATA_MAP
}
 
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
 //{{AFX_MSG_MAP(CAboutDlg)
  // No message handlers
 //}}AFX_MSG_MAP
END_MESSAGE_MAP()
 
/////////////////////////////////////////////////////////////////////////////
// CSK003Dlg dialog
 
CSK003Dlg::CSK003Dlg(CWnd* pParent /*=NULL*/)
 : CDialog(CSK003Dlg::IDD, pParent)
{
 //{{AFX_DATA_INIT(CSK003Dlg)
 m_strTarget = _T("");
 m_strUser = _T("");
 //}}AFX_DATA_INIT
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}
 
void CSK003Dlg::DoDataExchange(CDataExchange* pDX)
{
 CDialog::DoDataExchange(pDX);
 //{{AFX_DATA_MAP(CSK003Dlg)
 DDX_Control(pDX, IDC_LIST_MESSAGE, m_MessageList);
 DDX_Control(pDX, IDC_EDIT_WRITE, m_EditWrite);
 DDX_Text(pDX, IDC_EDIT_TARGET, m_strTarget);
 DDX_Text(pDX, IDC_EDIT_USER, m_strUser);
 //}}AFX_DATA_MAP
}
 
BEGIN_MESSAGE_MAP(CSK003Dlg, CDialog)
 //{{AFX_MSG_MAP(CSK003Dlg)
 ON_WM_SYSCOMMAND()
 ON_WM_PAINT()
 ON_WM_QUERYDRAGICON()
 ON_BN_CLICKED(IDC_BUTTON_SEND, OnButtonSend)
 ON_BN_CLICKED(IDC_BUTTON_COMFIRM, OnButtonComfirm)
 ON_MESSAGE(WM_RECVTEXT, OnRecvText)
 //}}AFX_MSG_MAP
END_MESSAGE_MAP()
 
/////////////////////////////////////////////////////////////////////////////
// CSK003Dlg message handlers
 
BOOL CSK003Dlg::OnInitDialog()
{
 CDialog::OnInitDialog();
 
 // Add "About..." menu item to system menu.
 
 // IDM_ABOUTBOX must be in the system command range.
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
 ASSERT(IDM_ABOUTBOX < 0xF000);
 
 CMenu* pSysMenu = GetSystemMenu(FALSE);
 if (pSysMenu != NULL)
 {
  CString strAboutMenu;
  strAboutMenu.LoadString(IDS_ABOUTBOX);
  if (!strAboutMenu.IsEmpty())
  {
   pSysMenu->AppendMenu(MF_SEPARATOR);
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
  }
 }
 
 // Set the icon for this dialog. The framework does this automatically
 // when the application‘s main window is not a dialog
 SetIcon(m_hIcon, TRUE); // Set big icon
 SetIcon(m_hIcon, FALSE); // Set small icon
 
 // TODO: Add extra initialization here
 WSADATA wsadata;
 WSAStartup(MAKEWORD(2, 2), &wsadata);
 m_bCreateSocket = FALSE;
 EnableCtrl(FALSE);
 return TRUE; // return TRUE unless you set the focus to a control
}
 
void CSK003Dlg::OnSysCommand(UINT nID, LPARAM lParam)
{
 if ((nID & 0xFFF0) == IDM_ABOUTBOX)
 {
  CAboutDlg dlgAbout;
  dlgAbout.DoModal();
 }
 else
 {
  CDialog::OnSysCommand(nID, lParam);
 }
}
 
// If you add a minimize button to your dialog, you will need the code below
// to draw the icon. For MFC applications using the document/view model,
// this is automatically done for you by the framework.
 
void CSK003Dlg::OnPaint()
{
 if (IsIconic())
 {
  CPaintDC dc(this); // device context for painting
 
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);
 
  // Center icon in client rectangle
  int cxIcon = GetSystemMetrics(SM_CXICON);
  int cyIcon = GetSystemMetrics(SM_CYICON);
  CRect rect;
  GetClientRect(&rect);
  int x = (rect.Width() - cxIcon + 1) / 2;
  int y = (rect.Height() - cyIcon + 1) / 2;
 
  // Draw the icon
  dc.DrawIcon(x, y, m_hIcon);
 }
 else
 {
  CDialog::OnPaint();
 }
}
 
// The system calls this to obtain the cursor to display while the user drags
// the minimized window.
HCURSOR CSK003Dlg::OnQueryDragIcon()
{
 return (HCURSOR) m_hIcon;
}
 
BOOL CSK003Dlg::CreateUDPSocket(USHORT uPort)
{
 SOCKET sock;
    SOCKADDR_IN addr;
    sock = socket(AF_INET, SOCK_DGRAM, 0);
 
 int optval = 1;
 if(SOCKET_ERROR == setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (const char*)&optval, sizeof(optval)))
 {
  closesocket(sock);
  return FALSE;
 }
 
 addr.sin_addr.s_addr = INADDR_ANY;
 addr.sin_family = AF_INET;
 addr.sin_port = htons(uPort);
    if(SOCKET_ERROR == bind(sock, (SOCKADDR*)&addr, sizeof(addr)))
    {
  closesocket(sock);
        AfxMessageBox("绑定端口失败");
        return FALSE;
    }
 m_hSocket = sock;
 return TRUE;
}
 
void CSK003Dlg::OnButtonSend()
{
 // TODO: Add your control notification handler code here
 CString strText;
 m_EditWrite.GetWindowText(strText);
 if(strText.IsEmpty())
 {
  AfxMessageBox("发送信息不能为空!");
  return;
 }
 CString strBuffer;
 strBuffer = m_strName;
 strBuffer += ":";
 strBuffer += strText;
 int nLen = strBuffer.GetLength();
 if(nLen > 4096)
 {
  AfxMessageBox("发送信息的长度太长未能发送!");
  return;
 }
    sendto(m_hSocket, strBuffer.GetBuffer(0), nLen, 0, (SOCKADDR*)&m_addrRemote, sizeof(SOCKADDR_IN));
 strBuffer.ReleaseBuffer();
 
 m_EditWrite.SetWindowText("");
}
 
void CSK003Dlg::OnButtonComfirm()
{
 // TODO: Add your control notification handler code here
 UpdateData(TRUE);
 if(m_strTarget.IsEmpty())
 {
  AfxMessageBox("信息发送的目的地址不能为空.");
  return;
 }
 if(m_strUser.IsEmpty())
 {
  AfxMessageBox("用户名不能为空,请填写任意用户名");
  return;
 }
 DWORD dwAddr = inet_addr(m_strTarget);
 m_addrRemote.sin_addr.s_addr = dwAddr;
 m_addrRemote.sin_family = AF_INET;
 m_addrRemote.sin_port = htons(6517);
 m_strName = m_strUser;
 
 if(!CreateUDPSocket(6517))
 {
  AfxMessageBox("创建UDP套接口失败!");
  return;
 }
 AfxMessageBox("创建UDP套接口成功!");
 CreateThread(NULL, 0, RecvFromThreadProc, this, 0, NULL);
 m_bCreateSocket = TRUE;
 EnableCtrl(TRUE);
}
 
DWORD WINAPI RecvFromThreadProc(LPVOID param)
{
 int nRecv = 0;
 char pBuffer[4097];
 SOCKADDR_IN addr;
 int addrlen = sizeof(addr);
 CSK003Dlg *pMainWnd = (CSK003Dlg*)param;
 while (TRUE)
 {
  memset(pBuffer, 0, 4096);
  nRecv = recvfrom(pMainWnd->m_hSocket, pBuffer, 4096, 0, (sockaddr*)&addr, &addrlen);
  if(nRecv == -1) break;
  pMainWnd->SendMessage(WM_RECVTEXT, 0, (LPARAM)pBuffer);
 }
 return 0L;
}
 
LRESULT CSK003Dlg::OnRecvText(WPARAM wParam, LPARAM lParam)
{
 LPCTSTR lpszText = (LPCTSTR)lParam;
 m_MessageList.AddString(lpszText);
 return 0L;
}
 
void CSK003Dlg::EnableCtrl(BOOL bChecked)
{
 CWnd *pWnd;
 CEdit *pEdit;
 pWnd = GetDlgItem(IDC_BUTTON_COMFIRM);
 pWnd->EnableWindow(!bChecked);
 
 pEdit = (CEdit*)GetDlgItem(IDC_EDIT_TARGET);
 pEdit->SetReadOnly(bChecked);
 
 pEdit = (CEdit*)GetDlgItem(IDC_EDIT_USER);
 pEdit->SetReadOnly(bChecked);
 
 pWnd = GetDlgItem(IDC_BUTTON_SEND);
 pWnd->EnableWindow(bChecked);
 
 pEdit = (CEdit*)GetDlgItem(IDC_EDIT_WRITE);
 pEdit->SetReadOnly(!bChecked);
}

用UDP实现聊天功能


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